From my understanding you are requesting for a chat system like we have on all the other devices. This sounds like a good idea but there is a major issue that could potentially stop this being a feature.
On any console with a controller of some kind it is really annoying to type messages. When you think about it, typing a message on any console will take at least 2-3 times longer to type it than on any other device. This is probably the reason why Roblox doesn’t allow chat in Xbox games because players will get annoyed because of how long a message takes to type. If players were able to view the chat they may feel left out because they may not think it is worth the time to type the message.
With all that said, this feature will give Xbox players a more social aspect just like you said in your post. However I do feel the negative aspects do out way the positives. For this to be a feature Roblox or Xbox will need to think of a way to speed up typing messages. Maybe a voice chat system that allows you to say a message then it goes into the chat as a text chat message.